"Apple Watch Series 9

45mm or 41mm case size

Aluminum metal or stainless steel

speaker

microphone

control:

Touch-responsive digital crown

side button

Click each other with two fingers twice

Execute Siri on device

monitor:

Always-on Retina LTPO OLED display

Welt design monitor

Ion-X glass surface (aluminum metal case)

Sapphire glass surface (stainless steel case)

Up to 2000 nits maximum brightness

Brightness as low as 1 nit

chip:

S9 SiP features a 64-bit dual-core processor

4 core Apple Neural Engine

64GB capacity

sensor:

Blood oxygen sensor and app Footnote 3

Electronic heart rate sensors and electrocardiogram apps Footnote 4

Third generation optical heart rate sensor

High or low heart rate notification Footnote 4

Arrhythmia Notice Footnote 5

sleep stages

Body temperature sensing Footnote 6

The compass app has waypoint and backtracking functions

Changqi altimeter

High g-force acceleration sensor

ambient light sensor

Splash, water and dust resistant:

Water resistant to 50 meters (suitable for swimming) Footnote 11

Dustproof IP6X Note 19

Connections and communications:

L1 GPS, GNSS, Galileo, and Beidou positioning system

LTE and UMTS Footnote 13

Wi-Fi 4 (802.11n)

Bluetooth 5.3

Second generation ultra-wideband chip Footnote 20

Apple Pay

GymKit

Power and battery life:

Built-in rechargeable lithium-ion battery

Typical use up to 18 hours Footnote 16

Low power mode provides up to 36 hours of use Note 16

USB-C magnetic fast charging cable"